课程简介：
虽然只有4课时，但是每个课时都有1个多小时的讲解，配有ppt。很全面。
Kafka 是分布式发布-订阅消息系统。它最初由 LinkedIn 公司开发，使用 Scala语言编写,之后成为 Apache 项目的一部分。Kafka 是一个分布式的，可划分的，多订阅者,冗余备份的持久性的日志服务。它主要用于处理活跃的流式数据。
Kafka的特点:
同时为发布和订阅提供高吞吐量。据了解，Kafka 每秒可以生产约 25 万消息(50 MB)，每秒处理 55 万消息(110 MB)。
可进行持久化操作。将消息持久化到磁盘，因此可用于批量消费，例如 ETL，以及实时应用程序。通过将数据持久化到硬盘以及 replication 防止数据丢失。
分布式系统，易于向外扩展。所有的 producer、broker 和 consumer 都会有多个，均为分布式的。无需停机即可扩展机器。
消息被处理的状态是在 consumer 端维护，而不是由 server 端维护。当失败时能自动平衡。
支持 online 和 offline 的场景。
视频截图： 
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